Box structure, battery pack and electric equipment

Abstract

This application provides a housing structure, a battery pack, and an electrical device. The housing structure includes a cover plate and a bottom plate, with an air inlet on the bottom plate. The cover plate and the bottom plate overlap to define the installation area. The cover plate has sequentially connected air supply holes, an air gathering space, and an air outlet, with the air supply holes positioned away from the air outlet. The air inlet connects to the air outlet sequentially through an installation cavity, the air supply holes, and the air gathering cavity. In this application, by providing an air gathering cavity, the airflow within the battery pack first converges in the air gathering cavity before exiting from the air outlet. This avoids the airflow around the cells near the air outlet being directly discharged from the air outlet, thereby extending the airflow path around the cells near the air outlet within the battery pack. This promotes more thorough airflow through each cell, thus improving the uniformity of airflow velocity around each cell within the battery pack. This improves the uniformity of heat dissipation between cells, reduces the temperature difference between cells, and thus improves the consistency of cell performance, thereby enhancing the reliability of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a housing structure, a battery pack, and an electrical device. Background Technology

[0002] The battery pack includes a housing structure with mounting cavities and battery modules housed within those cavities. Each battery module comprises multiple electrically connected cells. During operation, the cells generate heat, and excessively high temperatures can lead to performance degradation and reduced lifespan. Therefore, heat dissipation and cooling measures are necessary to ensure the cells operate at suitable temperatures.

[0003] In related technologies, air cooling is used to dissipate heat and reduce the temperature of the battery cells. Specifically, the casing structure is equipped with air inlets and outlets. Cool air is delivered into the mounting cavity through the air inlet, allowing the cool air to come into contact with the battery cells for heat exchange. Then, the air in the mounting cavity is discharged through the air outlet, thereby carrying away the heat from the battery cells. This achieves heat dissipation and cooling of the battery cells. However, this cooling method can lead to significant differences in the heat dissipation efficiency of some battery cells, resulting in uneven heat dissipation, large temperature differences between cells, poor consistency in cell performance, and an adverse impact on the reliability of the battery pack. Utility Model Content

[0004] The embodiments of this application provide a housing structure, a battery pack, and an electrical device that can improve the uniformity of heat dissipation of the battery cells, thereby reducing the temperature difference between the battery cells and improving the reliability of the battery pack.

[0005] In a first aspect, embodiments of this application provide a box structure, which includes a bottom plate and a cover plate. The bottom plate is provided with an air inlet. The cover plate and the bottom plate cover each other to define an installation cavity. An air supply hole, an air gathering space and an air outlet are provided on the cover plate in sequence. The air supply hole is located away from the air outlet. The air inlet is connected to the air outlet in sequence through the installation cavity, the air supply hole and the air gathering space.

[0006] In some embodiments, there are multiple air supply holes, and the density of the air supply holes increases along the direction away from the air outlet.

[0007] In some embodiments, there are multiple air supply holes, which are arranged sequentially in a direction away from the air outlet.

[0008] In some embodiments, along the direction away from the air outlet, the spacing between any two adjacent air outlets in the plurality of air outlets tends to decrease.

[0009] In some embodiments, the air supply holes are strip-shaped holes, and the direction of the major axis of the air supply holes is perpendicular to the arrangement direction of the air supply holes.

[0010] In some embodiments, the distance between the adjacent walls of two air outlets is D1, and the width of the air outlets in the arrangement direction is R, satisfying: 0.5R≤D1.

[0011] In some embodiments, the cover plate includes a top plate and an inner plate, the top plate and the inner plate being interlocked to define an air-gathering cavity, an air supply hole being disposed on the inner plate, and an air outlet being disposed on the top plate.

[0012] In some embodiments, the top plate has a groove, an inner plate is disposed in the groove, and the periphery of the inner plate is connected to the groove sidewall to define an air-gathering cavity between the inner plate and the groove bottom wall; the air outlet is disposed on the groove sidewall and located between the groove bottom wall and the inner plate.

[0013] In some embodiments, the inner panel includes a panel body and flanges. There are multiple flanges, which are respectively connected to multiple edges of the panel body. The multiple flanges correspond one-to-one with multiple groove sidewalls of the groove. Each flange is attached and connected to the corresponding groove sidewall. The air supply hole is provided in the panel body.

[0014] In some embodiments, both the top plate and the inner plate are sheet metal parts.

[0015] In some embodiments, the housing structure further includes an air outlet duct, one end of which is connected to the end of the air outlet away from the air gathering chamber; and / or, there are multiple air outlets.

[0016] Secondly, embodiments of this application provide a battery pack, which includes a battery module and the aforementioned housing structure; the battery module is disposed in the mounting cavity.

[0017] Thirdly, embodiments of this application provide an electrical device that includes the aforementioned battery pack.

[0018] The beneficial effects of the embodiments of this application are as follows:

[0019] In the embodiments of this application, by setting up an air-gathering cavity, the airflow within the battery pack first converges in the air-gathering cavity before being discharged from the air outlet. This avoids the airflow around the cells near the air outlet being directly discharged from the air outlet, thereby extending the flow path of the airflow around the cells near the air outlet within the battery pack. This promotes more thorough airflow through each cell, thus improving the uniformity of airflow velocity around each cell within the battery pack. This improves the uniformity of heat dissipation between cells, reduces the temperature difference between cells, and thus improves the consistency of cell performance, thereby enhancing the reliability of the battery pack. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the box structure provided in an embodiment of this application;

[0022] Figure 2 This is an exploded view of the box structure provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the internal structure of the box lid provided in an embodiment of this application;

[0024] Figure 4 This is a side view of the box lid provided in an embodiment of this application;

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of AA;

[0026] Figure 6 This is provided by the embodiments of this application. Figure 4 Enlarged structural diagram at point B;

[0027] Figure 7 This is a schematic diagram of the inner plate structure provided in an embodiment of this application;

[0028] Figure 8 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0029] Figure 9 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Box structure;

[0032] 11-Cover plate; 111-Air concentrator; 112-Air outlet; 113-Air outlet; 114-Top plate; 1141-Groove; 1142-Groove side wall; 1143-Groove bottom wall; 115-Inner plate; 1151-Plate body; 1152-Flanged edge;

[0033] 12 - Air outlet duct; 121 - Positioning flange;

[0034] 101 - Mounting cavity;

[0035] 21-Base plate; 211-Air inlet;

[0036] 1000-battery pack;

[0037] 300 - Battery module; 301 - Battery cell; 302 - Connector bar;

[0038] 400 - Electrical equipment; 41 - Motor; 42 - Controller. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only the elements expressly listed, but also other elements not expressly listed, or elements inherent to such a product.

[0044] Before introducing the enclosure structure, enclosure structure and battery pack provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0045] In related technologies, a battery pack includes a housing structure with a mounting cavity and battery modules disposed within the mounting cavity. Each battery module comprises multiple cells connected in series and parallel. The housing structure has an air inlet and an air outlet. Cool air is introduced into the mounting cavity through the air inlet, allowing the cool air to contact the battery cells for heat exchange. Then, the airflow within the mounting cavity is exhausted through the air outlet, carrying away the heat from the battery cells. This achieves heat dissipation and cooling of the battery cells.

[0046] When the mounting cavity is directly connected to the air outlet, the cold airflow from the inlet comes into contact with the battery cells for heat dissipation and is then directly discharged from the outlet. The closer a battery cell is to the outlet, the shorter the path and the lower the airflow drop between the outlet and the surrounding area. This results in a faster airflow velocity near the outlet and a slower velocity further away. In other words, airflow is faster near the outlet, while airflow is relatively slow elsewhere, and may even stagnate. This leads to poor heat dissipation efficiency in some cells, preventing them from achieving sufficient cooling. Consequently, there are significant temperature differences between the cells within the battery pack, resulting in poor cell performance consistency and reduced battery pack reliability.

[0047] Based on this, embodiments of this application provide a housing structure, a battery pack, and an electrical device to improve the uniformity of heat dissipation of the battery cells, reduce the temperature difference between the battery cells, thereby improving the consistency of battery cell performance and the reliability of the battery pack.

[0048] The following combination Figures 1 to 9 The following is a detailed description of the enclosure structure 10, battery pack 1000, and electrical equipment 400 provided in the embodiments of this application.

[0049] Please see Figures 1 to 5 , Figure 1 This is a schematic diagram of the box structure 10 provided in an embodiment of this application. Figure 2 This is an exploded view of the box structure 10 provided in an embodiment of this application. Figure 3 This is a schematic diagram of the internal structure of the box structure 10 provided in an embodiment of this application. Figure 4 This is a side view of the box structure 10 provided in an embodiment of this application. Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of AA.

[0050] In a first aspect, embodiments of this application provide a housing structure 10. The housing structure 10 includes a base plate 21 and a cover plate 11. The base plate 21 is provided with an air inlet 211. The cover plate 11 is provided with an air supply hole 112, an air concentrator 111, and an air outlet 113, which are sequentially connected. The air supply hole 112 is located away from the air outlet 113. The air inlet 211 is connected to the air outlet 113 sequentially through an mounting cavity 101, the air supply hole 112, and the air concentrator 111.

[0051] It is understandable that the air-gathering cavity 111 is located inside the cover plate 11.

[0052] It is understood that the cover plate 11 can be an assembly, which can be formed by assembling two parts to define the air-gathering cavity 111.

[0053] It is understandable that the cover plate 11 can also be a single piece. For example, the cover plate 11 can be molded into a single piece with an air-gathering cavity 111 by injection molding or blow molding.

[0054] Specifically, for ease of understanding, the application of the housing structure 10 to the battery pack 1000 is used as an example. When the housing structure 10 is applied to the battery pack 1000, the air inlet 112 is connected to the mounting cavity 101 of the housing structure 10 for mounting the battery module 300, and the end of the air outlet 113 away from the air-gathering cavity 111 is connected to the external environment or external components (e.g., cooling devices) of the mounting cavity 101. During thermal management of the battery pack 1000, a heat exchange airflow is introduced into the mounting cavity 101 through the air inlet 211. The heat exchange airflow enters the mounting cavity 101 and comes into contact with the battery cell 301 for heat exchange. Then, the airflow in the mounting cavity 101 enters the side of the air-gathering cavity 111 away from the air outlet 113 through the air inlet 112. Then, the airflow in the air-gathering cavity 111 is discharged through the air outlet 113. In this way, the heat of the battery cell 301 can be carried away by air cooling to dissipate heat and lower the temperature of the battery cell 301; or the battery cell 301 can be heated by heating it with air. In this way, the temperature of the battery cell 301 can be managed.

[0055] In this embodiment, by setting up an air-gathering cavity 111, the airflow within the battery pack 1000 first converges in the air-gathering cavity 111 before being discharged from the air outlet 113. This avoids the airflow around the battery cells 301 near the air outlet 113 being directly discharged from the air outlet 113, thereby extending the flow path of the airflow around the battery cells 301 near the air outlet 113 within the battery pack 1000. This allows the airflow to flow more fully through each battery cell 301, thus improving the uniformity of airflow velocity around each battery cell 301 within the battery pack 1000. This improves the uniformity of heat dissipation of the battery cells 301, reduces the temperature difference between the battery cells 301, and thus improves the performance consistency of the battery cells 301, thereby enhancing the reliability of the battery pack 1000.

[0056] Please see Figure 2 or Figure 4In some embodiments, there are multiple air supply holes 112. The density of the air supply holes 112 increases along the direction away from the air outlet 113. This results in a larger communication area between the mounting cavity 101 and the air concentrator 111, thereby enabling the airflow in the battery pack 1000 to mainly enter the air concentrator 111 from the side away from the air outlet 113, and also increasing the efficiency of the airflow in the mounting cavity 101 entering the air concentrator 111, thus improving heat dissipation efficiency.

[0057] It is understandable that, along the direction away from the air outlet 113, the density of the arrangement of some air supply holes 112 can be increased, or the density of the arrangement of air supply holes 112 can be increased sequentially, or along the direction away from the air outlet 113, multiple air outlets can be divided into multiple groups, with multiple air outlets in each group evenly arranged, and the density of air outlets in adjacent groups can be different.

[0058] Please see Figure 2 or Figure 4 In some embodiments, there are multiple air supply holes 112, which are arranged sequentially in a direction away from the air outlet 113. This makes the air supply structure layout regular, thereby reducing the manufacturing difficulty of the air supply structure.

[0059] Please see Figure 2 or Figure 4 In some embodiments, along the direction away from the air outlet 113, the spacing between any two adjacent air outlets 112 tends to decrease.

[0060] It is understandable that, along the direction away from the air outlet 113, the distance between two adjacent air supply holes 112 may be reduced, or the distance between two air supply holes 112 may be reduced sequentially, or along the direction away from the air outlet 113, multiple air outlets may be divided into multiple groups, with the distance between two adjacent air outlets in each group being consistent, and the distance between air outlets in two adjacent groups being different.

[0061] In this embodiment, the above-mentioned settings can both increase the density of the air supply holes 112 in the direction away from the air outlet 113 and simplify the density variation setting of the air supply holes 112, thereby making the structure of the housing structure 10 simple, easy to manufacture, and conducive to improving the manufacturing efficiency of the housing structure 10.

[0062] Please see Figure 2 or Figure 4 In some embodiments, the air supply hole 112 is a strip-shaped hole, and the direction of the major axis of the air supply hole 112 is perpendicular to the arrangement direction of the air supply holes 112. In this way, the interval between two adjacent air supply holes 112 can form a rib-like connection, thereby ensuring the structural strength of the box structure 10 while providing a large area of ​​air supply holes.

[0063] In addition, the strip-shaped hole can be adapted to the structure of the housing structure 10, so as to reduce the difficulty of arranging the air supply holes 112. Specifically, multiple air supply holes 112 are arranged at intervals along the length direction of the housing structure 10, and the major axis of each air supply hole 112 is parallel to the width direction of the housing structure 10.

[0064] Please see Figure 6 , Figure 6 This is provided by the embodiments of this application. Figure 4 An enlarged structural diagram at point B. In some embodiments, the distance between the adjacent walls of two air supply holes 112 is D1. The width of the air supply holes 112 in the arrangement direction is R, satisfying: 0.5R≤D1. This helps to ensure the size of the gap between two adjacent air supply holes 112, thereby helping to ensure the structural strength of the rib-like connection formed by the gap between two adjacent air supply holes 112, and thus helping to improve the structural strength of the housing structure 10.

[0065] Please see Figure 3 In some embodiments, the cover plate 11 includes a top plate 114 and an inner plate 115. The top plate 114 and the inner plate 115 are interlocked to define an air-gathering cavity 111. An air supply hole 112 is disposed on the inner plate 115. An air outlet 113 is disposed on the top plate 114.

[0066] Specifically, the top plate 114 can be glued, welded or bolted to the inner plate 115 and a sealing ring can be disposed therebetween.

[0067] In this embodiment, the above-mentioned arrangement makes the cover plate 11 composed of the top plate 114 and the inner plate 115, thereby reducing the manufacturing difficulty of the cover plate 11 and improving the manufacturing efficiency of the box structure 10.

[0068] Please see Figure 2 and Figure 3 In some embodiments, the top plate 114 has a groove 1141. An inner plate 115 is disposed within the groove 1141, with its periphery connected to the groove sidewall 1142 of the groove 1141, thus defining an air-gathering cavity 111 between the inner plate 115 and the groove bottom wall 1143 of the groove 1141. An air outlet 113 is disposed on the groove sidewall 1142 and located between the groove bottom wall 1143 and the inner plate 115. In this way, the inner plate 115 can be quickly positioned by contacting the groove sidewall 1142 of the groove 1141 with the inner plate 115, thereby improving the assembly efficiency between the top plate 114 and the inner plate 115 and enhancing the manufacturing efficiency of the housing structure 10.

[0069] Please see Figure 7 , Figure 7This is a schematic diagram of the structure of the inner panel 115 provided in an embodiment of this application. In some embodiments, the inner panel 115 includes a panel body 1151 and flanges 1152. There are multiple flanges 1152. The multiple flanges 1152 are respectively connected to multiple edge lines of the panel body 1151. The multiple flanges 1152 correspond one-to-one with multiple groove sidewalls 1142 of the groove 1141. Each flange 1152 is attached and connected to the corresponding groove sidewall 1142. An air outlet 112 is provided in the panel body 1151. In this way, the contact area between the inner panel 115 and the top panel 114 can be increased, thereby improving the reliability of the connection between the inner panel 115 and the top panel 114, which in turn improves the reliability of the housing structure 10.

[0070] In some embodiments, both the top plate 114 and the inner plate 115 are sheet metal parts.

[0071] Specifically, the top plate 114 is welded to the inner plate 115.

[0072] It is understandable that sheet metal parts are components made from metal sheets (such as steel sheets, aluminum sheets, copper sheets, etc.) through processes such as stamping, bending, welding, and stretching.

[0073] In this embodiment, by setting the top plate 114 and the inner plate 115 to be sheet metal, the material utilization rate can be improved, waste can be reduced, and manufacturing costs and subsequent maintenance costs can be reduced.

[0074] Please see Figure 2 In some embodiments, the housing structure 10 also includes an air outlet duct 12. One end of the air outlet duct 12 is connected to the end of the air outlet 113 away from the air gathering chamber 111. In this way, the air outlet 113 can be quickly connected to an external pipeline through the air outlet duct 12, thereby improving the ease of operation of connecting the housing structure 10 to other components.

[0075] Specifically, the air outlet duct 12 is inserted into the cover plate 11 and welded to it. A positioning flange 121 is fitted onto the outer circumferential surface of the air outlet duct 12. The positioning flange 121 is located outside the cover plate 11 and abuts against it. In this way, the depth of the air outlet duct 12 inserted into the cover plate 11 can be positioned by the positioning flange 121, which helps to improve the efficiency of the assembly of the air outlet duct 12 and the cover plate 11.

[0076] Please see Figure 2 In some embodiments, there are multiple air outlets 113. This improves the air outlet efficiency of the housing structure 10, thereby improving heat dissipation efficiency.

[0077] In some embodiments, a sealing gasket is provided between the cover plate 11 and the base plate 21. The sealing gasket extends in an annular shape around the periphery of the base plate 21. The cover plate 11 is connected to the base plate 21 by screws, which compresses the sealing gasket, thereby sealing the contact surface between the cover plate 11 and the base plate 21.

[0078] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery pack 1000 provided in an embodiment of this application. In a third aspect, an embodiment of this application provides a battery pack 1000, which includes a battery module 300 and the aforementioned housing structure 10. The battery module 300 is disposed in the mounting cavity 101.

[0079] It is understood that the battery module 300 includes multiple battery cells 301 and a connection row 302 that electrically connects the multiple battery cells 301.

[0080] It is understood that the battery pack 1000 includes the aforementioned housing structure 10, and the battery pack 1000 has all the beneficial effects of the housing structure 10, which will not be described again in this embodiment.

[0081] Please see Figure 9 Embodiments of this application also provide an electrical device 400. The electrical device 400 includes a battery pack 1000 provided in some embodiments of this application.

[0082] It can be understood that battery pack 1000 supplies power to the power-consuming devices of electrical equipment 400.

[0083] It is understood that the electrical equipment 400 provided in the application embodiments can be, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0084] For example, electrical equipment 400 is a vehicle, such as... Figure 9 As shown. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery pack 1000 is installed inside the vehicle, and the battery pack 1000 can be located at the bottom, front, or rear of the vehicle. The battery pack 1000 can be used to power the vehicle; for example, the battery pack 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 42 and a motor 41. The controller 42 is used to control the battery pack 1000 to supply power to the motor 41, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0085] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A box structure (10), characterized in that, include: The base plate (21) is provided with an air inlet (211); as well as The cover plate (11) covers the bottom plate (21) to define the mounting cavity (101); An air supply hole (112), an air gathering chamber (111), and an air outlet (113) are sequentially connected on the cover plate (11), with the air supply hole (112) located away from the air outlet (113); The air inlet (211) is connected to the air outlet (113) in sequence through the mounting cavity (101), the air supply hole (112) and the air gathering cavity (111).

2. The box structure (10) according to claim 1, characterized in that, There are multiple air supply holes (112), and the density of the arrangement of the air supply holes (112) increases along the direction away from the air outlet (113).

3. The box structure (10) according to claim 2, characterized in that, The plurality of air supply holes (112) are arranged sequentially in a direction away from the air outlet (113).

4. The box structure (10) according to claim 3, characterized in that, Along the direction away from the air outlet (113), the spacing between any two adjacent air outlets (112) tends to decrease.

5. The box structure (10) according to claim 3, characterized in that, The air supply hole (112) is a strip-shaped hole, and the direction of the major axis of the air supply hole (112) is perpendicular to the arrangement direction of the air supply hole (112).

6. The box structure (10) according to claim 5, characterized in that, The distance between the adjacent walls of two air supply holes (112) is D1, and the width of the air supply hole (112) in the arrangement direction is R, satisfying: 0.5R≤D1.

7. The box structure (10) according to any one of claims 1-6, characterized in that, The cover plate (11) includes a top plate (114) and an inner plate (115). The top plate (114) and the inner plate (115) are interlocked to define the air-gathering cavity (111). The air supply hole (112) is disposed on the inner plate (115), and the air outlet (113) is disposed on the top plate (114).

8. The box structure (10) according to claim 7, characterized in that, The top plate (114) has a groove (1141), and the inner plate (115) is disposed in the groove (1141). The periphery of the inner plate (115) is connected to the groove sidewall (1142) of the groove (1141) to define the air-gathering cavity (111) between the inner plate (115) and the groove bottom wall (1143) of the groove (1141). The air outlet (113) is disposed on the side wall (1142) of the trough and is located between the bottom wall (1143) of the trough and the inner plate (115).

9. The box structure (10) according to claim 8, characterized in that, The inner plate (115) includes a plate body (1151) and flanges (1152). There are multiple flanges (1152), and the multiple flanges (1152) are respectively connected to multiple edge lines of the plate body (1151). The multiple flanges (1152) correspond one-to-one with multiple groove sidewalls (1142) of the groove (1141). Each flange (1152) is attached and connected to the corresponding groove sidewall (1142). The air supply hole (112) is provided on the plate body (1151).

10. The box structure (10) according to claim 7, characterized in that, Both the top plate (114) and the inner plate (115) are sheet metal parts.

11. The box structure (10) according to any one of claims 1-6, characterized in that, The housing structure (10) further includes an air outlet pipe (12), one end of which is connected to the end of the air outlet (113) away from the air gathering chamber (111); and / or, There are multiple air outlets (113).

12. A battery pack (1000), characterized in that, include: The box structure (10) as described in any one of claims 1-11; as well as A battery module (300) is disposed in the mounting cavity (101).

13. An electrical appliance, characterized in that, Includes the battery pack (1000) as described in claim 12.

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